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Effect of hafnium addition on solidification structure of cast Ti-46AI alloys

Su Yanqing Zhang Li Guo Jingjie K. Maruyama Li Zhiming

中国铸造2008，Vol.5Issue(4)：229-233,5.

Effect of hafnium addition on solidification structure of cast Ti-46AI alloys

Su Yanqing ¹Zhang Li ¹Guo Jingjie ²K. Maruyama ¹Li Zhiming³

作者信息

1. School of Materials Science and Engineering, Harbin Institute of Technology, P.O. Box 428, Harbin 150001, China
2. Department of Materials Science and Engineering,Harbin University of Science and Technology, P.O. Box 90, Harbin 150080, China
3. Graduate School of Environmental Studies, Tohoku University, 02 Aobayama, Sendai 980-8579, Japan Harbin University of Science and Technology, P.O. Box 90, Harbin 150080, China
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摘要

Abstract

To investigate the effect of hafnium addition on the solidification structure, Ti-46Al alloys with nominal compositions of Ti-46Al-xHf (x = 0, 3, 5, 7) (at.%) were arc-melted into small ingots in an argon atmosphere. The characteristics of the macrostructures and microstructures were studied using a linear intercept method, OM, SEM (BSE), XRD and TEM. The results showed that the ingots with Hf have near lamellar microstructure in columnar and dendrite morphology. The hafnium concentration has a strong effect on the columnar spacing refinement. Increasing Hf from 0 to 7 (at.%), the columnar spacing can be reduced from～1000 to～400 pm. Constitute phases of the ingots are α2, a small amount of B2 and γ. Most of the B2 phases, richer in Hf and leaner in AI and Ti, exist on the node of the dendrite core in block shape and a little across the lamellar colonies in stick shape. The γ phases exist on the boundaries of lamellar colonies in small cellular shape. There also exists a segregation of Hf on the columnar and dendrite core. Particularly, both the α- andβ-phase form from the melt as prior phases. The possible phase sequencing during solidification and solid-state transformations with Hf is given in this paper.

关键词

hafnium addition/solidification structure/Ti-46Al alloys/phase sequencing

Key words

hafnium addition/solidification structure/Ti-46Al alloys/phase sequencing

分类

矿业与冶金

引用本文复制引用

Su Yanqing ,Zhang Li,Guo Jingjie,K. Maruyama ,Li Zhiming..Effect of hafnium addition on solidification structure of cast Ti-46AI alloys[J].中国铸造,2008,5(4):229-233,5.

基金项目

The study was supported by the National Natural Science Foundation of China)50771041 and NCET 05-0350. （）

中国铸造

OASCI

ISSN：1672-6421

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